Anticline
In geology, an anticline is an area of rock deformation that involves a downward slope to either side. In an exposed eroded anticline the oldest rock layers are in the center and the rocks on either side dip or slope away from the center of the structure. The rock at the center of the anticline is higher than the same stratum elsewhere. Anticlines typically form during crustal warping as the result of compression concurrent with orogenic mountain building.